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4.一個具有七個質子、七個電子及八個中子的元素是下列哪一個?(A)Si (B) N (C) P (D) C
問題詳情
4.一個具有七個質子、七個電子及八個中子的元素是下列哪一個?
(A)Si
(B) N
(C) P
(D) C
參考答案
用户評論
【
江百善
】評論
七個質子推原子序氫氦鋰鈹硼碳氮 第七個即是氮 N
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3.一個水分子,最多可形成幾個氫鍵?(A)0 (B) 2 (C) 4 (D) 無限多個
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34.在25oC時,下列電池的電動勢為多少V? (已知此電池的標準電動勢為 1.10 V) (A)0.61(B)1.22(C)1.83(D)2.44
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